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Full-Text Articles in Engineering
Investigating The Role Of Iron In The Photogranulation Phenomenon, Abeera Ayaz Ansari
Investigating The Role Of Iron In The Photogranulation Phenomenon, Abeera Ayaz Ansari
Doctoral Dissertations
Oxygenic photogranules (OPGs) are dense spherical microbial aggregates that are used for self-aerating wastewater treatment. Filamentous cyanobacteria are key granulating species, providing structural backbone and integrity in OPGs. Currently, the mechanisms for selecting filamentous cyanobacteria and their ability to form spherical OPGs are not well understood. Literature shows that iron (Fe) availability plays a significant role in the cyanobacterial growth and colony formation. Moreover, Fe availability is known to be dependent upon light, which is an essential growth substrate for the phototrophs. This research has investigated the role of Fe in the photogranulation phenomenon and the impact of light intensity …
Factors Impacting The Cultivation, Structure, And Oxygen Profiles Of Oxygenic Photogranules For Aeration-Free Wastewater Treatment, Megan Hann
Environmental & Water Resources Engineering Masters Projects
Oxygenic photogranules (OPGs) are novel biogranules which have successfully treated wastewater without external aeration at the bench scale. The formation of OPGs under both static and hydrodynamic conditions is a unique phenomenon which has no known counterpart. This report examines some of the granulation mechanisms and structural and functional differences between statically and hydrodynamically cultivated OPGs. As previously reported, filamentous cyanobacteria are an essential component of both types of OPGs. The addition of Oscillatoria in augmented activated sludge inoculum showed successful static OPG formation in a shorter time (28 vs 35 days) and produced more settled OPGs than native sludge …
The Role Of Nitrification And Denitrification In Successful Cultivation Of Oxygenic Photogranules For Wastewater Treatment, Kristie Stauch-White
The Role Of Nitrification And Denitrification In Successful Cultivation Of Oxygenic Photogranules For Wastewater Treatment, Kristie Stauch-White
Environmental & Water Resources Engineering Masters Projects
Oxygenic photogranules (OPGs) are compact, spherical, self-immobilizing biofilms in the form of dense aggregates of microorganisms with a predomination of filamentous cyanobacteria cultivated from photoilluminated activated sludge. In this study, aerobic and anaerobic nitrogen transformation processes occurring simultaneously within OPGs, during both successful and unsuccessful cultivations, were examined. Chemical analyses including ammonium, nitrate, and nitrite concentrations at the beginning and periodically during OPG cultivations indicated nitrogen transformations occurring during successful cultivations. Additionally, qPCR studies revealed that successful cultivations supported a greater relative abundance of cyanobacteria, nitrifying, and denitrifying populations during the cultivation period. Dissolved oxygen microprofiles within a successfully cultivated …